所谓爱国心,是指因你生为这个国家的国民,相信这个国家比其他一切的国家高贵优越。
创新不仅仅是技术的问题;它是关于改变思维方式并为后代创造可持续的解决方案。
And when your stomach is empty and your mind is full,it's always hard to sleep.
The only way to learn mathematics is to do mathematics.